Cycled jet cooling mechanism



Feb. 27, 1962 o. H. NUSS CYCLED JET coouuc MECHANISM 5 Sheets-Sheet 1 Filed Aug. 13, 1958 INVENTOR OSCAR H. NUSS BY :54"

ATTORNEY Feb. 27, 1962 o. H. NUSS CYCLED JET COOLING MECHANISM 5 Sheets-Sheet 2 Filed Aug. 13, 1958 QN\ KW @Q mm mw 1 NQ\ x mv 7 Q 3 u w Q mm mm m w .H t H w G 8 R mm (m INVENTOR OSCAR H. NUSS BY fl ATTORNEY Feb. 27, 1962 o. H. Nuss 3,022,694

CYCLED JET COOLING MECHANISM 5 Shee ts-Sheet 3 Filed z- 1a, 1958 A T TORNE Y Feb. 27, 1962 o. 'H. NUSS CYCLED JET COOLING MECHANISM 5 Sheets-Sheet 4 Filed Aug. 15, 1958 FIG. 9

FIG. IO

INVENTOH. OSCAR H. NUSS M 2% ATTORNEY Feb. 27, 1962 o. H. Nuss 3,022,694

CYCLED JET coouuc MECHANISM Filed Aug. 13, 1958 5 Sheets-Sheet 5 FIG. ll

NA 1W INVENTOR. OSCAR H. NUSS ATTORNEY 3,622,694 CYCLED JET CQOLENG MECHANISM Oscar I-I. Nuss, Lancaster, Pa., assignor, by mesne assignmens, to De Walt, Inc a corporation of Delaware Filed Aug. 13, 1958, Ser. No. 754,824 10 Claims. (Cl. 83-169) This invention relates to producing and cycling a spray or mist used or useful as a coolant and/or lubricant, as for example in material cutting or other working operations.

It has been recognized for some time that the use of a mist coolant has many advantages over liquid coolant. It has a higher cooling efiiciency and, conversely, requires less coolant handling. 7

It is necessary or desirable that the jet of mist coolant be stopped during a non-cutting portion of a cycle and be immediately restored for the cutting portion. Thus it is desirable to have a structure and device that will provide instantaneous stop and start-up of the mist spray. It has been found in conventional devices on the market that instantaneous stopping and starting is not possible. The evices heretofore known, when stopped, give a stream of mist or liquid that peters down gradually from full pressure to stop, while on start-up, the devices hertofore known permit blow-by or a blast of liquid or both alternately, rather than a mist.

it is an object of my invention to provide a system and a device whereby a spray can be instantaneously stopped and started.

It is a further object of my invention to provide a system in which the jet nozzle for the mist will not leak or siphon when the system is turned oif so that it is immediately ready to instantaneously produce a mist upon start-up.

It is still another object of my invention to provide a pressurized spray system that may be instantaneously cut off so that the spray is delivered either at substantially full pressure or not at all.

it is an object of my invention to accomplish the above results by maintaining a constant head of pressure on the liquid source of the mist coolant.

it is a further object of my invention to provide means for utilizing the system in conjunction with cutting means cyclically operating on a cutting stroke and non-cutting stroke as in a cutoff system.

It is an object of the invention to provide means for applying mist coolant during the cutting cycle, instantaneously stopping the delivery of coolant at the completion of the cutting cycle and again instantaneously re-applying it during the recommencement of the cutting cycle.

The novel features which I believe to be characteristic of my invention are set forth with particularity in the appended claims. My invention, however, both as to organ zation and method operation may be understood by reference to the following description taken in connection with the accompanying drawings, in which:

FIG. 1' is a side elevation of a reciprocating rotary cutter illustrated in conjunction with a coolant mist generating system;

FIG. 2 is a partial plan view of the same;

FIG. 3 is an enlarged plan View of the jet nozzle and its adjustable mounting means;

FIG. 4 is a side elevation of the same taken on line 4-4 of FIG. 3;

PEG. 5 is a sectional end elevation of. a nozzle supporting bracket taken on line 5-5 of FIG. 4;

FIG. 6 is a detailed side elevation partly in section of the spray control valve in conjunction with the coolant reservoir and air distributing chamber;

united htates iPatent O FIG; 7 is a detailed end elevation of the cycling control valve as seen from line '7-7 of FIG. 1;

FIG. 8 is an end elevation of the cycling control valve housing and its actuating mechanism taken on line 8-8 of FIG. 1; 7

FIG. 9 is a partial sectional plan view of the saw carriage drive, piston shown in conjunction with the cycling control valve and its actuating mechanism;

' FIG. 10 is a partial end elevation illustrating the arrangement of the mist generating system taken on line 10-10 of FIG. 1;

FIG. 11 is a side elevation partly in section of a modifled solenoid controlled cycling valve; and 7 FIG. 12 is an electrical diagram of the circuit of the solenoid controlled cycling valve.

' Referring to FIGS. 1, 2, 3 and'4, there is shown a cutting machine 26 having a vertical standard 22 supporting ahor'izontal track 24 along which a carriage 26 is slidably'mounted. Carriage 26 carries a yoke 28 supporting a suitable trunnion 30 of a motor 32 to whose arbor is secured a cutting blade 34. Also mounted on the motor and about the cutting blade is a guard 36 to which is adjustably attached a rod 38 which may be secured in an adjusted position by-the wing nut 40. The lower end of the rod 38 carries bracket 42 to which is slidably mounted by means of the knurled screw 44 a jet atomizer 46 of the type commonly known by the proprietary name of De Vilbiss The atomizer 46 has an air supply conduit 48 and a liquid supply conduit 50 and a delivery jet nozzle 52. The air and liquid, both of which are under pressure, are mixed in nozzle 52 and delivered as a mist. If on cutofi or start-up there is excessive variation between the gas and the liquid pressure, there will be single phase ejection of gas or liquid. Also, if the mixing of gas and liquid under pressure occur further back along the line there will be a petering of the jet spray at cutoff and a separation to phase with siphoning or draining of liquid during a shutdown period so that with startup, blow-by or an alternate gas and liquid phase will be delivered. The atomizer 46 may be upwardly or downwardly adjusted by means of sliding the rod 38. It may be adjusted inwardly or outwardly toward the work area by means of the screw 44 and the bracket 42. Additionally, it may be adjusted to the left or right of the cutting blade or the work area by swinging and/ or sliding on securing screw 39 in the slot 4-1 of bracket 42. Thus a substantially universal adjustment is possible; The direction of the jet is further adjustable by rotating the jet nozzle 52 upwardly or downwardly about its junction with the gas and liquid tubes 48, 54 as indicated by the arrows in FIG. 4. The conduits 47 and 49 may be conveniently retained in a sheathing 51 passing through a bracket 54 in the upper end of the rod 38.

Automatic motive power reciprocates the carriage 26 as may be seen more clearly in FIGS. 1, 2 and 9. Gas under pressure is supplied from a constant source (not shown) communicating with the conduit 114 (FIGS. 1, 2. and 6) which communicates with an arm of T junction 116 through emergency shut-elf valve 118 secured to the support 53. Conduit 84 communicating with the valve "78 is connected to the stem of the T junction 116 while a conduit 12% communicates with the other arm of the T junction. The pneumatic cylinder 56 is mounted to the This cycling is accomplished by means ofa trip rod 64 secured at its one end to the bracket 62 and slidably 3 mounted at its other end along stop rod 66 by means of bracket 68. Adjustable stops 7t and 72 are mounted on the stop rod 66. The stop rod is connected at its right end to a lever 73 secured to a short rock shaft76 mounted on the housing of a control valve 78. A lever 74 also secured to rock shaft 76 is connected to the spindle shaft 80 of the spindle valve 82. Spindle valve 78'by means of a tongue .85 operates a slide valve 86 over various ports in the bell end 38 of pneumatic cylinder 56. As compressed gas from a sourceof constant pressure is delivered to valve 78 through the conduit 84 it will pass around spindle 82 past valve slide 86 through port 98 into pneumatic cylinder 56 behind piston 57 moving piston 57,

connecting rod 6%) and carriage 26 to the left for a work cycle. When the bracket 68 of trip rod 64 strikes the stop 72, the stop rod 66, lever 73, lever 74, spindle valve 82 and slide valve 86 will be moved to the dotted line position shown in FIG. 9. Compressed gas delivered from the duct 84 will then pass through the conduit 92 of the valve through the conduit 94 of the cylinder to the opposite side of the piston thereby returning (non-working cycle) the piston to the right hand position until bracket 68 strikes stop 70 returning through the connected linkage the lever 74 and valvular parts to the full line position shown in FIG. 9. 'Mechanisms, not shown are generally provided to damper or control the velocity of piston 57 particularly for the work cutting stroke.

The ports 96 and 98 communicate with the atmosphere. It'will be noted that during the feed stroke to the left, the gases ahead of the pistons will be exhausted through the conduit 94, port 92 and port 96. When the slide valve 86 is in the dotted line position, the gases will be exhaustedto the atmosphere through the ports 90,98.

The conduit 120 communicates with the upper portion of the cavity of liquid reservoir 1 22 thereby maintaining a constant pressure head on the liquid. The liquid is then forced upward through a conventional bottom tube (not shown) in the reservoir to conduit 124 which communicates with a throttling needle valve 126 communicating with the valve 112. r g V The bell end 88 of the pneumatic cylinder has an-; other port 100 which is in communication with air pressure when and only when the slide valve 86 is in the solid line position. This port 100. communicates with the conduit 102 leading to a T junction 104. V

, The main flow of cycled air then passes through the throttling needle valve 106 into the air conduit 47 which then communicates with conduit 48 of the De 'Vilbiss atomizer 46. Pressure of the cycled air from the T junction .104 is simultaneously applied to the enlarged spindle head 198 of valve spindle 110 of liquid control valve 112. This raises spindle 110 against the loading of spring 128 to deliver liquid out port 130 to liquid conduit 49 leading to atomizer 46. V

Operation Compressed air is applied to the conduit 114, passes through the conduit 84 and by means of the valve 78 the piston 57 is reciprocated backward and forward for complete cycle. Forward movement of the piston to the left represents the work stroke and backward movement of the piston to the right represents the idling stroke. During the work stroke, compressed air is applied by the valve 78 to the'conduit 102 thereby applying air past the T junction 104 tothe conduits 47, 48 of the Dev Vilbiss nozzle and at the same time opening the liquid control valve 112 to admit liquid to the conduits 49, 50 of the De Vilbiss nozzle. 7 The liquid in the reservoir 122 is kept under a constant pressure head through the T 116 and conduit 120 irrespective of the cycling by valve 78.

The needle throttling valve 126 for the liquid is located between the reservoir 122 and the liquid control valve 112. This is an important feature of the invention since, located at this point, the valve is not subjected to cycled of the small amount of compressed airiinvolvedand the velocity at which it travels, the loss of air pressure at the intake side of the atomizer is not material and builds up almost substantially instantaneously when restored at the start-up'portion of the cycle.

Upon start-up of the work portion, of the cycle, compressed air substantially simultaneously fills the conduits 47, 48 and at the same time operates the liquid control valve 112 to apply liquid pressure to the liquid remaining in conduits 49, 50' of the atomizer. This results in a substantially immediate supply of a spray jet. When the valve 78 cuts ofi gas under pressure to the conduit 102,

the pressure of the liquid and gas of the atomizer is stopped immediately without further flow 0r siphoning of liquid from the nozzle. The throttling needle vflves 106 and 126 provide accurate and infinite (within the capacity of the system) adjustment means for controlling'both the gross velocity of the spray coolant and the liquid to gas ratio, from entirely liquid to entirely gas. I A modification of the invention is shown in FIGS. 1

and 12, in which the function of the valve 78 with respect to the conduit102 is replaced by a solenoid operated cycling valve 132. This embodiment could be utilized where other means, as for example manual, hydraulic or mechanical, are usedror operating thesaw carriage 26.

Referring to FIG. 11, the conduit 134 communicates with a source (not shown) of gas under pressure. Sole noid operated valve 132 has a valve stem 138 which cycles air to the conduit 162a leading to the T junction104. The remaining reference parts in FIG. 11 are identical to the corresponding parts in the first described embodiment and they operate identically. Accordingly, the same reference numeralshave been applied to the figure and further description is deemed unnecessary.

The electrical diagram illustrated in FIG. 12 is designed to operate solenoid valve 132 in a desired cycle. It consists of a hold-in relay 140 which is activated by momen tary closing of the normally open switch NO. 7 The closing of the relay 140 activates the solenoid 132 to the open position. Momentary opening of the normally closed switch NC permits the relay 140 to drop out to deener= gize the solenoid 132 thereby closing the valve 138. Switches NC and NO may be conveniently operated by stops such as the stops 70 and 72 of the first embodiment. That is, the stop 70 when contacted would momentarily close the normally open switch NO and the stop 72 when contacted would momentarily open the normally closed switch NC thereby cycling air to the conduit 102a.

It is obvious that either illustrated embodiment of this invention could be used with a system employing a stationary cutter having means to move the workpiece. It is further obvious that the invention could be used with any application requiring cycled control of an atomized mist.

I claim:

1. In a jet spray device, a source of liquid under pressure, a nozzle, a liquid conduit communicating said liquid source to said nozzle, a source of gas under pressure, a gas conduit'communicating said gas source to said nozzle, a valve in said liquid conduit separate from said nozzle, a mechanism to operate said valve, said mechanism being operatively responsive to pressure in said gas conduit to atively mounted in said liquid conduit at a point in said conduit betveen said liquid controlling valve and said source.

2. In combination with a cutoflf device, a reciprocating mechanism operative to produce relative motion between said cutofi device a work piece, stop trips associated with said reciprocating mechanism to control and delimit its stroke, a source of liquid under pressure, a source of gas under pressure, a spray nozzle, a liquid conduit communicating said liquid source with said nozzle, a gas conduit communicating said gas source with said nozzle, a normally closed liquid valve closing said liquid conduit, a mechanism to open said normally closed valve, said mechanism being responsive to pressure in said gas conduit to open said liquid valve, valve means in said gas conduit between said source and said mechanism, said valve means being operated from said trip stops to cycle gas from said source into said gas conduit on each stroke of said reciprocating mechanism, and a throttling valve in said liquid conduit between said normally closed valve and said source, whereby said throttling valve will not damp the closing action of said normally closed valve.

3. Reciprocating means associated with a cutoil tool and having a Work stroke and an idling stroke, a nozzle mounted adjacent said cutoff tool to apply a jet spray on a work stroke, a source of liquid under pressure, a source of gas under pressure, a liquid conduit communicating said liquid source with said nozzle, a gas conduit independently communicating said gas some with said nozzle, a valve in said liquid conduit, mechanism to open said valve in response to pressure in said gas conduit, 21 valve interposed between said gas conduit and said source, means operatively connected with said reciprocating mechanism to open said gas valve at the initiation of a work stroke and to close said valve at the completion of a work stroke whereby gas may enter said gas conduit and said nozzle during a work stroke and substantially instantaneously therewith liquid under pressure will enter said noz zie, and a liquid throttling valve located between said liquid valve and said liquid source.

4. A device substantially as set forth in claim 1, further characterized by a throttling valve in said gas conduit.

5. A device substantially as set forth in claim 3, further characterized by a gas throttling valve in said gas conduit subsequent to said responsive mechanism.

6. A spray generator capable of substantially immediate operation and shutdown and having a mixing nozzle for liquid and gas, a source of gas under pressure, a source of liquid under pressure, a liquid valve separate from said nozzle communicating said liquid source to said nozzle, and means communicating said gas source to said nozzle, mechanism operative in responsiv to said gas communicating means to open said liquid valve, and a throttling valve between said liquid source and said liquid valve.

7. In combination, a power tool having a reciprocating carriage, a work-engaging element on said carriage, means to reciprocate said carriage, said means including a pneumatic cylinder having forward and reverse ports and further having an auxiliary port, a slide valve including a reciprocating plunger, a source of compressed air, conduit means from said source to said slide valve, means to actuate said reciprocating plunger in said slide valve, said means including a trip rod actuated by said reciprocating carriage, whereby said slide valve uncovers said forward and reverse ports in sequence to cycle said reciprocating carriage, one of said ports corresponding to a work stroke, a reservoir of liquid coolant, conduit means from said source of compressed air to said reservoir, whereby a constant pressure is maintained on said liquid coolant, a spray coolant nozzle positioned adjacent to said work-engaging element, a liquid control valve, conduit means from said reservoir to said liquid control valve, a throttle valve in said conduit means, conduit means from said liquid control valve to said nozzle, a T-junction, conduit means from said auxiliary discharge port to said junction, conduit means from said junction to said liquid control valve, and conduit means including a throttle valve from said junction to said nozzle, whereby when said plunger in said slide valve reciprocate to uncover said forward and reverse ports in sequence, said auxiliary port will be uncovered on the work stroke to supply compressed air to said junction, thereby supplying compressed air to said nozzle and also actuating said liquid control valve to supply coolant to said nozzle, and whereby a mist spray coolant is supplied to said workengaging element only during the work stroke.

8. In combination, a source of compressed air, a T- junotion, conduit means from said source to said junction, an air control valve, conduit means from said junction to said air control valve, a liquid reservoir, conduit means from said junction to said reservoir to maintain a constant pressure on said liquid, at liquid control valve, conduit means including a throttle valve from said reservoir to said liquid control valve, 21 second T-junction, conduit means from said air control valve to said second junction, conduit means from said second junction to said liquid control valve, said liquid control valve being responsive to the discharge of said air control valve, a nozzle, conduit means from said liquidcontrol valve to said nozzle, and conduit means including a throttle valve from said second junction to said nozzle, whereby liquid is supplied to said nozzle only when compressed air is supplied to said nozzle, and whereby the amounts of liquid and compressed air supplied to said nozzle are separately and independently controlled by said throttle valves.

9. In combination, a source of gas under pressure, a slide valve having a closed position and an open position, means to cycle said valve from one position to another, conduit means from said gas source to said valve, a source of liquid under pressure, a liquid control valve, conduit means from said pressurized liquid source to said liquid control valve, 9. throttle valve in said conduit means, a T-junction, conduit means from said slide valve to said junction, conduit means from said junction to said liquid control valve, a nozzle, conduit means from said liquid control valve to said nozzle, conduit means from said junction to said nozzle, and a throttle valve in said lastnarned conduit means, whereby gas and liquid under pressure are supplied to said nozzle only when said slide valve is cycled to the open position, said liquid control valve being actuated by a constant pressure of gas, and whereby the amounts of gas and liquid under pressure supplied to said nozzle are separately and independently controlled by said throttle valves.

10. In combination: a reciprocating carriage having a work stroke and an idle stroke, a power-driven workengaging element carried by said carriage, means including an air cylinder to reciprocate said carriage, a source of compressed air, conduit means from said compressed air source to said air cylinder, an air valve in said conduit means, said air valve having two positions corresponding respectively to the work stroke and the idle stroke of said carriage, whereby in one position of said air valve said carriage moves on its work stroke, and in the other posi tion of said air valve said carriage moves on its idle stroke, means responsive to the reciprocation or" said carriage to actuate said air valve from one position to the other position, a mist spray nozzle adjacent said workengaging element, conduit means including a throttle valve from said air valve to said nozzle, whereby compressed air is admitted through said air valve to said nozzle in the position of said valve corresponding to the work stroke of said carriage, a source of liquid coolant under pressure, a liquid control valve, conduit means including a throttle valve from said liquid coolant source to said liquid control valve, conduit means from said liquid control valve to said nozzle, conduit means from said air valve to said liquid control valve, said liquid control valve being opened only when said air valve admits compressed air to said nozzle, whereby when said air valve admits compressed air to said nozzle during the work stroke of said carriage, said liquid control valve is opened to simultaneously admit liquid coolant under pres suretto said nozzle,tsaicl liquid control valve being closed during the idle stroke of said carriage, and whereby the relative amounts of liquid coolant and compressed air may be separately and independently regulated UNITED STATES PATENTS Gustafsson et al.' Feb. 8, 1933 Stephenson et a1 Dec. 11, 195] Casey Feb. 15, 1955 Paasche May 3, 1955 Remmen Q. Aug. 6, 1957 Knollenberg June 17, l58 Veres Sept. 2, 1958 Skoog May 17, 1960 

